Washington County, Oregon

Washington County is one of 36 counties in the U.S. state of Oregon. As of the 2010 census, the population was 529,710, making it the second most populous county in the state. The county seat and largest city is Hillsboro. Washington County is included in the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area. Cities in Washington County include Hillsboro, Beaverton, Tigard, and Forest Grove, the oldest city in the county.

Washington County, Oregon

Washington County is one of 36 counties in the U.S. state of Oregon. As of the 2010 census, the population was 529,710, making it the second most populous county in the state. The county seat and largest city is Hillsboro. Washington County is included in the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area. Cities in Washington County include Hillsboro, Beaverton, Tigard, and Forest Grove, the oldest city in the county.